A Ratiometric Fluorescent Bioprobe Based on Carbon Dots and Acridone Derivate for Signal Amplification Detection Exosomal microRNA
作者:Yaokun Xia、Liangliang Wang、Juan Li、Xiangqi Chen、Jianming Lan、An Yan、Yun Lei、Sheng Yang、Huanghao Yang、Jinghua Chen
DOI:10.1021/acs.analchem.8b01143
日期:2018.8.7
There was high fluorescence resonance energy transfer (FRET) efficiency between carbon dots (CDs) and DSA when the bioprobe was assembled. However, in the presence of the target, with disassembling of the fluorescent bioprobe, the fluorescence intensities of CDs and DSA were changed simultaneously. Because of the ratio of dual fluorescence intensities, this ratiometric fluorescent bioprobe was able
近来,外泌体微小RNA(miRNA)的灵敏和选择性检测已引起广泛关注,因为它与许多复杂疾病有关,包括癌症。在此,我们报告了一种基于DNA标记的碳点(DNA-CD)和5,7-二硝基-2-磺基ac啶酮(DSA)并与目标催化信号放大偶联的比例荧光生物探针,用于检测外泌体miRNA- 21 组装生物探针时,碳点(CD)和DSA之间的荧光共振能量转移(FRET)效率很高。然而,在存在靶标的情况下,随着荧光生物探针的分解,CD和DSA的荧光强度同时改变。由于双重荧光强度的比例,该比例荧光生物探针能够通过计算两个不同波长的发射强度比来抵消环境波动,其强度和稳定性足以检测外泌体miRNA-21。此外,我们证明了单个miRNA-21在理论上可以用DSA催化多个CD的分解,从而在检测miRNA-21的荧光比率方面产生了显着变化。使用这种信号放大策略,检测限低至3.0 fM。此外,由于引入了锁定核酸以介导链置换